#  strace -eopen asterisk -U asterisk -G asterisk
open("/etc/ld.so.cache", O_RDONLY)      = 3
open("/lib/libdl.so.2", O_RDONLY)       = 3
open("/lib/libpthread.so.0", O_RDONLY)  = 3
open("/lib/libncurses.so.5", O_RDONLY)  = 3
open("/lib/libm.so.6", O_RDONLY)        = 3
open("/lib/libresolv.so.2", O_RDONLY)   = 3
open("/usr/lib/libssl.so.0.9.7", O_RDONLY) = 3
open("/lib/libc.so.6", O_RDONLY)        = 3
open("/lib/libgpm.so.1", O_RDONLY)      = 3
open("/usr/lib/libcrypto.so.0.9.7", O_RDONLY) = 3
open("/dev/urandom", O_RDONLY)          = 3
open("/etc/asterisk/asterisk.conf", O_RDONLY) = 3
open("/etc/nsswitch.conf", O_RDONLY)    = 3
open("/etc/ld.so.cache", O_RDONLY)      = 3
open("/lib/libnss_compat.so.2", O_RDONLY) = 3
open("/lib/libnsl.so.1", O_RDONLY)      = 3
open("/etc/ld.so.cache", O_RDONLY)      = 3
open("/lib/libnss_nis.so.2", O_RDONLY)  = 3
open("/lib/libnss_files.so.2", O_RDONLY) = 3
open("/etc/group", O_RDONLY)            = 3
open("/etc/passwd", O_RDONLY)           = 3
open("/etc/localtime", O_RDONLY)        = -1 EACCES (Permission denied)
open("/etc/localtime", O_RDONLY)        = -1 EACCES (Permission denied)
open("/etc/localtime", O_RDONLY)        = -1 EACCES (Permission denied)
open("/etc/localtime", O_RDONLY)        = -1 EACCES (Permission denied)
Cannot stat() '/etc/asterisk/extconfig.conf', ignoring
open("/var/run/asterisk/asterisk.pid", O_WRONLY|O_CREAT|O_TRUNC, 0666) = -1 EACCES (Permission denied)
open("/etc/localtime", O_RDONLY)        = -1 EACCES (Permission denied)
open("/etc/localtime", O_RDONLY)        = -1 EACCES (Permission denied)
open("/etc/localtime", O_RDONLY)        = -1 EACCES (Permission denied)
Unable to open pid file '/var/run/asterisk/asterisk.pid': Permission denied
Unable to open pid file '/var/run/asterisk/asterisk.pid': Permission denied
Unable to bind socket to /var/run/asterisk/asterisk.ctl: Permission denied